Allow Editing of Line Items in Orders from Online Marketplaces
Here's our use case:
We sell multi-day Juice cleanses, which have a complicated delivery process. We deliver fresh pressed juices every two days of a cleanse, such that in order to process this for fulfillment, we split our orders---one for each 2-day delivery---and modify the Line Item Titles indicating which days of the cleanse are to be delivered.
We started this process in a manual store and then were surprised the same ability to modify an order's line items is not available in orders from Online Marketplaces.

Hey @James, thank you for posting this! Manual orders are ones that are the most flexible since they are created in ShipStation, and your store’s orders should remain largely untouched as they are the most accurate source of information.
Have you looked into using order tags, internal notes, or custom fields to store this information? You can create filters for any of the mentioned fields—and they can be included on packing slips—so locating these orders and shipping them will be easy once you have everything set up.
2 comments
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Mark Spruell Ann's Fabulous Finds commented
I'm with James and Jack -- we would find this functionality to be very helpful as well, as customers often change (or add to) their order by phone long after the original order is created. Obviously this can be done with a manual order (that is then combined), but that is clunky compared to just adding a line item or just editing it right in shipstation. I realize this could create problems for users that don't have any use for this functionality, but you could just unlock the functionality in the store settings.
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Jack Humbert Ortholinear Keyboards commented
I integrate with squarespace, and they don't allow any editing of orders either, so I'm stuck leaving messages in the notes section which often get missed/ignored, causing me to ship out the wrong items. Even if I do see it, their packing slips are incorrect, and lead to confusion about whether or not they were charged for the missing/incorrect items. Luckily the customs forms are editable, but them being mismatched with the packing slip can cause trouble when going through customs inspection. Explaining to my customers that my shipping software doesn't allow modifications is a bit of a pain.
Being a developer myself, and knowing that manual orders allow editing of the items, this seems like it'd be an easy feature to add - the way the addresses are handled (ignoring future updates from the marketplace, etc) seems like it would be appropriate here as well.
Customers will often change their mind on a certain item, or upgrade their items before I'm able to ship them (I have 3 week ship times), and being able to adjust the items in the order manually (even though they are imported with squarespace) is important to keeping my customers happy.